NFPA 551-2019 Guide for the Evaluation of Fire Risk Assessments. Collateral issues beyond the scope of the FRA or exclu‐ sions from the FRA may become the questions of additional FRAs, but should not divert the FRA from its specific objectives. 4.4.2 Elements of Risk. The following elements that affect the fire risk should be characterized. The exposed target at risk should be identified. This may include any or all of the following: (1) People (occupants, employees, general public, emer‐ gency responders) (2) Property (structures, systems, components of the built environment) (3) Environment (national parks, monuments, hazardous materials) (4) Mission (heritage, business continuity, information/ communication)
4.4.4 Methods. Choice of Methods. The method that was used should be outlined, and its appropriateness to the objectives of the FRA should be documented. The documentation should include a brief description of method of solution, numerical computations (including identification of units used), and identification of the source or derivation of all equations that are not in common usage. Methods may include a variety of elements based on the problem definition. These elements may be qualitative or quantitative and may involve deterministic or probabilistic models. Each element of the method should be applied prop‐ erly within its scope and limitations. (See Chapter 5.) 4.4.5 Data.* The fire stimuli to which the target is vulnerable should be characterized. These may include any or all of the following: Data used with the selected method should be appro‐ priate and of sufficient quality to support decision making for the defined problem (See Chapter 6.) (1) Heat (radiant flame, convective gases) (2)* Smoke (obscuration, respirable, corrosive/conductive aerosols) (3) Gases (toxic, corrosive) (4) Explosions (overpressure, projectiles) The transport phenomena, which bring the fire stimuli into contact with the exposed target, should be characterized. The response of the exposed target to the resulting fire stimuli should be assessed to determine whether the defined acceptance criteria have been met. The scope and the limitation of input data should be expressly documented. Sources of data should be identified. Any assumption or default values used in the absence of data should be explained clearly. The FRA methods, data, and results should be docu‐ mented to allow review and to provide for changes in manage‐ ment or conditions that could affect the fire risk. (See Chapter 6.)NFPA 551 pdf download.